libXxf86dga provides the XFree86-DGA extension, which allows direct
graphics access to a framebuffer-like region, and also allows relative
mouse reporting, et al. It is mainly used by games and emulators for
games.
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More information about X.Org can be found at:
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This module can be found at
git://anongit.freedesktop.org/git/xorg/lib/libXxf86dga